I prepared ''Pitcher Plants of the Old World'' in response to the lack of available information on dozens of species of ''Nepenthes''. Since many species of ''Nepenthes'' are not in cultivation, and also because there is often confusion concerning those that are, I resolved to study and photograph each species of ''Nepenthes'' and ''Cephalotus'' in the wild, in order to document each adequately. After graduating from university in 2006 at the age of 23, I began three years of intense research focusing on ''Nepenthes'' and ''Cephalotus'', and spent a cumulative total of eighteen months in the field. Over the last three years, I climbed over one hundred mountains across Southeast Asia in search of species of ''Nepenthes''. Many of these journeys were relatively simple, lasting just a few days or less. Others required more extensive effort, and in a few cases, I spent more than one week to find a single ''Nepenthes'' taxon.